buer | 6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f

General

Target

6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe
Size

1.9MB
MD5

fbaf48e37d532389bc0dbb3bc48c629f
SHA1

7b5d1a86826b4f947c14369acce0d27198119bec
SHA256

6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f
SHA512

945623b3aa28676b93b7b9d49c4dc548b6b5e76838268563abd8ba6d75027567663cb78647698ef908f89ab22de5718f94727cefddfd0a41f38bc5ca60ea61d0

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://bbload01.top/

http://bbload02.top/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\ErrorResponder\\errorResponder.exe\""	errorResponder.exe

Buer Loader 1 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/1796-56-0x000000003FC90000-0x0000000040131000-memory.dmp	buer

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Executes dropped EXE 1 IoCs

pid	Process
844	errorResponder.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	errorResponder.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	errorResponder.exe

Deletes itself 1 IoCs

pid	Process
844	errorResponder.exe

Identifies Wine through registry keys 2 TTPs 2 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Wine	errorResponder.exe
Key opened	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Wine	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe

Loads dropped DLL 8 IoCs

pid	Process
1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe
1756	WerFault.exe
1756	WerFault.exe
1756	WerFault.exe
1756	WerFault.exe
1756	WerFault.exe
1756	WerFault.exe
1756	WerFault.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe
844	errorResponder.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1756	844	WerFault.exe	28

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe
844	errorResponder.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1796 wrote to memory of 844	1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe	28
PID 1796 wrote to memory of 844	1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe	28
PID 1796 wrote to memory of 844	1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe	28
PID 1796 wrote to memory of 844	1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe	28
PID 1796 wrote to memory of 844	1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe	28
PID 1796 wrote to memory of 844	1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe	28
PID 1796 wrote to memory of 844	1796	6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe	28
PID 844 wrote to memory of 540	844	errorResponder.exe	29
PID 844 wrote to memory of 540	844	errorResponder.exe	29
PID 844 wrote to memory of 540	844	errorResponder.exe	29
PID 844 wrote to memory of 540	844	errorResponder.exe	29
PID 844 wrote to memory of 1756	844	errorResponder.exe	30
PID 844 wrote to memory of 1756	844	errorResponder.exe	30
PID 844 wrote to memory of 1756	844	errorResponder.exe	30
PID 844 wrote to memory of 1756	844	errorResponder.exe	30

C:\Users\Admin\AppData\Local\Temp\6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe
"C:\Users\Admin\AppData\Local\Temp\6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1796
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\6d969949ad751206ad4a722f8305585b88113a1abf342411fc9bbb5e79d4834f.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Deletes itself
  - Identifies Wine through registry keys
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:844
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:540
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 844 -s 376
    3⤵
    - Loads dropped DLL
    - Program crash
    PID:1756

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

1

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/844-61-0x0000000077400000-0x0000000077580000-memory.dmp

Filesize
1.5MB

Download
memory/844-62-0x000000003F4F0000-0x000000003F991000-memory.dmp

Filesize
4.6MB

Download
memory/1796-54-0x00000000753B1000-0x00000000753B3000-memory.dmp

Filesize
8KB

Download
memory/1796-56-0x000000003FC90000-0x0000000040131000-memory.dmp

Filesize
4.6MB

Download
memory/1796-55-0x0000000077400000-0x0000000077580000-memory.dmp

Filesize
1.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads